Cryogenic Butterfly Valve

Abstract

The utility model relates to a low-temperature butterfly valve, in which a valve stem is arranged in a valve body; a replaceable sealing device is fixed at one end of the valve stem; the replaceable sealing device is sealed with a sealing surface arranged on the valve body. A low-temperature butterfly valve capable of having a replaceable sealing device is realized, which solves the technical problem that in the existing low-temperature butterfly valve, the sealing device generally used is fixed to the valve stem, and once the sealing device is damaged, the entire valve stem and the sealing device need to be replaced, and the replacement cost is high.

Description

Technical Field

[0001] The embodiment of the utility model relates to a butterfly valve, in particular to a low-temperature butterfly valve. Background Art

[0002] In the existing cryogenic butterfly valves, the sealing devices generally used are fixed to the valve stem. Once the sealing device is damaged, the entire valve stem and the sealing device need to be replaced, and the replacement cost is high. Utility Model Content

[0003] The purpose of the embodiments of the utility model is to provide a low-temperature butterfly valve capable of having a replaceable sealing device.

[0004] In order to achieve the above-mentioned purpose, the embodiment of the utility model designs a low-temperature butterfly valve, comprising:

[0005] Valve body;

[0006] A valve stem, the valve stem is arranged in the valve body;

[0007] A replaceable sealing device is fixed on one end of the valve stem; the replaceable sealing device is sealed with a sealing surface arranged on the valve body.

[0008] Furthermore, in the low-temperature butterfly valve of the present invention, the replaceable sealing device is connected to a protrusion arranged inside the valve body, and the sealing surface is arranged on the protrusion; and a plurality of sealing grooves are arranged on the sealing surface.

[0009] Furthermore, in the cryogenic butterfly valve of the utility model, the sealing surface and the protrusion perform surface contact sealing.

[0010] Furthermore, in the cryogenic butterfly valve of the utility model, the replaceable sealing device further comprises:

[0011] A butterfly plate, the butterfly plate being fixed on the valve stem by bolts;

[0012] A sealing ring is fixed on the butterfly plate.

[0013] A pressure plate ring is fixed on the outer side of the sealing ring with bolts; the pressure plate ring presses the sealing ring.

[0014] Furthermore, in the low-temperature butterfly valve of the utility model, the bottom cover is fixed to the bottom of the valve body with bolts; a gasket is arranged between the valve body and the bottom cover; a concave hole is arranged at the bottom of the valve body; a lower bushing is arranged in the concave hole, and the bottom of the valve stem extends into the lower bushing.

[0015] Further, in the low-temperature butterfly valve of the utility model, in the middle of the valve body, above the replaceable sealing device; between the valve body and the valve stem, the valve stem is sleeved with an upper bushing;

[0016] On the upper bushing, in the valve body, and in the valve stem, a bushing is inserted;

[0017] At the upper part of the bushing, one end of an extension rod is fixed on the valve body, and a winding pad is arranged between the extension rod and the valve body.

[0018] Further, in the low-temperature butterfly valve of the utility model, at the other end of the extension rod, between the valve stem and the extension rod, a gasket is sleeved on the valve stem;

[0019] Place packing on the valve stem above the gasket;

[0020] A packing gland is fixed on the extension rod with bolts and nuts above the packing; the packing gland presses the packing.

[0021] Furthermore, in the low-temperature butterfly valve of the utility model, one end of the bracket is fixed to the other end of the extension rod; and a worm gear box is fixed to the other end of the bracket.

[0022] Furthermore, in the low-temperature butterfly valve of the utility model, a flat key is provided in the worm gear box, and the flat key is connected to the valve stem.

[0023] Furthermore, in the low-temperature butterfly valve of the utility model, a hand wheel is fixed on the worm gear box.

[0024] Compared with the prior art, the implementation of the utility model is to set a valve stem in the valve body; fix a replaceable sealing device at one end of the valve stem; and seal the replaceable sealing device with a sealing surface set on the valve body. A low-temperature butterfly valve with a replaceable sealing device is realized, which solves the technical problem that in the existing low-temperature butterfly valve, the sealing device generally used is fixed to the valve stem. Once the sealing device is damaged, the entire valve stem and the sealing device need to be replaced, and the replacement cost is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the half-section structure of the utility model. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the utility model clearer, the various embodiments of the utility model will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the various embodiments of the utility model, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.

[0027] The embodiment of the utility model relates to a low temperature butterfly valve, such as Figure 1 As shown, including:

[0028] The valve body 5 serves as the base of the cryogenic butterfly valve in this embodiment;

[0029] A valve stem 9 is disposed in the valve body 5; the valve stem 9 is mainly used to rotate the replaceable sealing device 100;

[0030] A replaceable sealing device 100 is fixed at one end of the valve stem 9; the replaceable sealing device 100 is sealed with a sealing surface 101 provided on the valve body 5. The replaceable sealing device 100 is used to seal the passage. A low-temperature butterfly valve capable of replacing the sealing device 100 is realized, which solves the technical problem that in the existing low-temperature butterfly valve, the sealing device generally used is fixed to the valve stem. Once the sealing device is damaged, the entire valve stem and the sealing device need to be replaced, and the replacement cost is high.

[0031] In order to achieve the above technical effects, in the cryogenic butterfly valve of this embodiment, Figure 1 As shown, the replaceable sealing device 100 and the protrusion 102 arranged inside the valve body 5, and the sealing surface 101 is arranged on the protrusion 102. The sealing surface 102 and the replaceable sealing device 100 are sealed.

[0032] In order to achieve the above technical effects, in the cryogenic butterfly valve of this embodiment, Figure 1 As shown, the sealing surface 101 and the protrusion 102 perform surface contact sealing; a plurality of sealing grooves 103 are provided on the sealing surface 101. The surface contact sealing has good sealing performance; the sealing grooves 103 can increase the pressure in the contact surface during the sealing process.

[0033] In order to achieve the above technical effects, in the cryogenic butterfly valve of this embodiment, Figure 1 As shown, the replaceable sealing device 100 further includes:

[0034] The butterfly plate 10 is fixed on the valve stem 5 by bolts; the butterfly plate 10 switches the cryogenic butterfly valve of this embodiment during the rotation of the valve stem 9;

[0035] A sealing ring 6 is fixed on the butterfly plate 10, and the sealing ring 6 is used to seal the passage of the cryogenic butterfly valve of this embodiment;

[0036] The pressure plate ring 7 is fixed with bolts on the outer side of the sealing ring 6; the pressure plate ring 7 presses the sealing ring 6; the pressure plate ring 7 is used to fix the sealing ring 6.

[0037] In order to achieve the above technical effects, in the cryogenic butterfly valve of this embodiment, Figure 1 As shown, a bottom cover 1 is fixed to the bottom of the valve body 5 with bolts; a gasket 3 is arranged between the valve body 5 and the bottom cover 1; a concave hole 2 is arranged at the bottom of the valve body 5; a lower bushing 4 is arranged in the concave hole 2, and the bottom of the valve stem 5 extends into the lower bushing 4. The valve stem 5 rotates in the bushing 4; the bushing 4 can position the valve stem 5.

[0038] In order to achieve the above technical effects, in the cryogenic butterfly valve of this embodiment, Figure 1 As shown, in the middle of the valve body 5, above the replaceable sealing device 100; between the valve body 5 and the valve stem 9, the valve stem 5 is sleeved with an upper bushing 12;

[0039] On the upper bushing 12, in the valve body 5, the bushing 13 is inserted into the valve stem 5;

[0040] At the upper part of the bushing 13 , one end of the extension rod 21 is fixed on the valve body 5 , and a winding pad 14 is arranged between the extension rod 21 and the valve body 5 .

[0041] In order to achieve the above technical effects, in the cryogenic butterfly valve of this embodiment, Figure 1 As shown, at the other end of the extension rod 21, between the valve stem 9 and the extension rod 21, a gasket 17 is inserted on the valve stem 9;

[0042] Above the gasket 17, put the packing 18 on the valve stem 9;

[0043] Above the packing 18, a packing gland 22 is fixed on the extension rod 21 with bolts and nuts; the packing gland 22 presses the packing 18. The packing 18 is used to seal the gap between the valve stem 9 and the extension rod 21.

[0044] In order to achieve the above technical effects, in the cryogenic butterfly valve of this embodiment, Figure 1 As shown, one end of a bracket 26 is fixed on the other end of the extension rod 21; a worm gear box 28 is fixed on the other end of the bracket 26. The worm gear box 28 is used to drive the valve stem 9.

[0045] In order to achieve the above technical effects, in the cryogenic butterfly valve of this embodiment, Figure 1 As shown, a flat key 27 is connected to the valve stem 9 in the worm gear box 28 .

[0046] In order to achieve the above technical effects, in the cryogenic butterfly valve of this embodiment, Figure 1 As shown, a hand wheel 29 is fixed on the worm gear box 28. The hand wheel 29 rotates the worm gear box 28, driving the valve stem 9 to rotate.

[0047] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A cryogenic butterfly valve, characterized in that: include: Valve body; A valve stem, the valve stem is arranged in the valve body; a replaceable sealing device, the replaceable sealing device being fixed at one end of the valve stem; The replaceable sealing device is sealed with a sealing surface provided on the valve body; The replaceable sealing device further comprises: A butterfly plate, the butterfly plate being fixed on the valve stem by bolts; A sealing ring is fixed on the butterfly plate. A pressure plate ring is fixed on the outer side of the sealing ring with bolts; the pressure plate ring presses the sealing ring.

2. The cryogenic butterfly valve according to claim 1, characterized in that: The replaceable sealing device is sealed with a protrusion arranged inside the valve body, and the sealing surface is arranged on the protrusion.

3. The cryogenic butterfly valve according to claim 2, characterized in that: The sealing surface and the protrusion are in surface contact sealing; a plurality of sealing grooves are arranged on the sealing surface.

4. The cryogenic butterfly valve according to claim 1, characterized in that: A bottom cover is fixed at the bottom of the valve body with bolts; a gasket is arranged between the valve body and the bottom cover; a concave hole is arranged at the bottom of the valve body; a lower bushing is arranged in the concave hole, and the bottom of the valve stem extends into the lower bushing.

5. The cryogenic butterfly valve according to claim 1, characterized in that: In the middle of the valve body, above the replaceable sealing device; between the valve body and the valve stem, where the valve stem is sleeved with an upper bushing; On the upper bushing, in the valve body, and in the valve stem, a bushing is inserted; At the upper part of the bushing, one end of an extension rod is fixed on the valve body, and a winding pad is arranged between the extension rod and the valve body.

6. The cryogenic butterfly valve according to claim 5, characterized in that: At the other end of the extension rod, between the valve stem and the extension rod, a washer is sleeved on the valve stem; Place packing on the valve stem above the gasket; A packing gland is fixed on the extension rod with bolts and nuts above the packing; the packing gland presses the packing.

7. The cryogenic butterfly valve according to claim 6, characterized in that: One end of the bracket is fixed on the other end of the extension rod; and a worm gear box is fixed on the other end of the bracket.

8. The cryogenic butterfly valve according to claim 7, characterized in that: A flat key is used in the worm gear box to connect the valve stem.

9. The cryogenic butterfly valve according to claim 8, characterized in that: A hand wheel is fixed on the worm gear box.

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